| 11136 Plaster lath
Plaster lath shall be made from mild steel sheet free of flaws, defects and rough edges. Plaster lath shall be expanded metal, perforated black sheets or dovetailed type made by pressing steel sheets. The size of the holes in the sheets or the aperture made by the mesh shall not be less than 0.5mm. Plaster lath shall be galvanized steel or mild steel protected with one coat of anti-rust primer.
11137 Mortar
111371 Mix proportion
Refer to the Specification under execution for the mix proportion of each type of mortar.
111372 Mixing mortar
The ingredients of mortar shall be measured in accurate gauge boxes for volume. Mortar shall be mixed in an approved mechanical batch mixer. Dry ingredients of mortar shall in the first instance, be mixed until there is a uniform consistency in colour. Water shall be added and the mixing continued until there is a uniform distribution of the materials and the mass is uniform in colour and consistency. In no case shall mixing be carried out for less than two minutes after adding water. Sufficient water shall be added to the mix to produce a pure consistency.
In instances where hand mixing is unavoidable, the cement content shall be increased by 10%. The dry and wet mixes shall be turned over sufficient number of times to produce the respective consistencies as required by batch mixers. Cement mortar shall be used within half hour of adding cement to the mix. Compo-mortar shall be used within one hour of adding cement to the mix.
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